4.4BSD/usr/src/contrib/X11R5-lib/lib/X/Xsi/TextPerBd.c
/*
* $XConsortium: TextPerBd.c,v 1.16 92/07/29 11:39:57 rws Exp $
*/
/*
* Copyright 1990, 1991 by OMRON Corporation, NTT Software Corporation,
* and Nippon Telegraph and Telephone Corporation
* Copyright 1991 by the Massachusetts Institute of Technology
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the names of OMRON, NTT Software, NTT, and M.I.T.
* not be used in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission. OMRON, NTT Software,
* NTT, and M.I.T. make no representations about the suitability of this
* software for any purpose. It is provided "as is" without express or
* implied warranty.
*
* OMRON, NTT SOFTWARE, NTT, AND M.I.T. DISCLAIM ALL WARRANTIES WITH REGARD
* TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS, IN NO EVENT SHALL OMRON, NTT SOFTWARE, NTT, OR M.I.T. BE
* LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Authors: Li Yuhong OMRON Corporation
*
*/
/*************************************************************************
* *
* TextPerExtBody.c -- body of functions: *
* XmbTextPerCharExtents() *
* XwcTextPerCharExtents() *
* *
*************************************************************************/
/*--------------------------- BEGIN -------------------------------------*/
#ifdef DecomposeGlyphCharset
XLocale xlocale = ((XsiFontSet)font_set)->xlc;
XFontStruct *fnt;
unsigned char gstr[BUFSIZ];
int ctid;
int glen;
int scanned, ret;
int count, i;
XCharStruct overall;
int max_ascent, max_descent;
XCharStruct *onechar;
#define MAX(a, b) ((a > b)? a : b)
#define MIN(a, b) ((a < b)? a : b)
#ifdef XML
if (!xlocale)
xlocale = _XFallBackConvert();
#endif
overall.ascent = 0;
overall.descent = 0;
overall.width = 0;
overall.lbearing = 0;
overall.rbearing = 0;
max_ascent = 0;
max_descent = 0;
count = 0;
_Xmbinit(xlocale);
_Xctinit(xlocale);
while (text_len > 0 && count < buffer_size) {
/* buffer size */
glen = BUFSIZ;
scanned = 0;
ret = DecomposeGlyphCharset(xlocale, text, text_len,
gstr, &glen, &scanned, &ctid);
/*
* if ret is BadEncoding, uncovered wrong codepoint, must stop!
*/
if (ret == BadEncoding || scanned == 0)
break;
/*
* if missing font, no drawing or measuring
*/
if ((fnt = _XsiQueryFontSetFromId(font_set, ctid)) != NULL) {
/*
* only 1 or 2 byte-encoding font supported by X.
*/
if (!count) {
max_ascent = fnt->ascent;
max_descent = fnt->descent;
} else {
max_ascent = MAX(max_ascent, fnt->ascent);
max_descent = MAX(max_descent, fnt->descent);
}
if (fnt->min_byte1 != 0 || fnt->max_byte1 != 0)
glen &= ~1;
for (i = 0; i < glen && count < buffer_size; i++, count++) {
int ind, d, byte1, byte2;
/*
* get index of glyph of font.
*/
if (fnt->min_byte1 == 0 && fnt->max_byte1 == 0) {
byte2 = gstr[i];
if (byte2 > fnt->max_char_or_byte2)
ind = 0;
else
ind = byte2 - fnt->min_char_or_byte2;
} else {
d = fnt->max_char_or_byte2 - fnt->min_char_or_byte2 + 1;
byte1 = gstr[i++];
byte2 = gstr[i];
if (byte1 > fnt->max_byte1 ||
byte2 > fnt->max_char_or_byte2)
ind = 0;
else
ind = (byte1 - fnt->min_byte1) * d
+ (byte2 - fnt->min_char_or_byte2);
}
if (fnt->per_char != NULL)
onechar = fnt->per_char + ind;
else
onechar = &(fnt->max_bounds);
/*
* set ink & logical extent.
*/
ink_extents_buffer[count].x = overall.width + onechar->lbearing;
ink_extents_buffer[count].y = - onechar->ascent;
ink_extents_buffer[count].width =
onechar->rbearing - onechar->lbearing;
ink_extents_buffer[count].height =
onechar->ascent + onechar->descent;
logical_extents_buffer[count].x = overall.width;
logical_extents_buffer[count].y = - fnt->ascent;
logical_extents_buffer[count].width = onechar->width;
logical_extents_buffer[count].height =
fnt->ascent + fnt->descent;
/*
* get min and max of ink/logical extent.
*/
if (!count) {
overall = *onechar;
} else {
overall.ascent = MAX(overall.ascent, onechar->ascent);
overall.descent = MAX(overall.descent, onechar->descent);
overall.lbearing = MIN(overall.lbearing,
overall.width + onechar->lbearing);
overall.rbearing = MAX(overall.rbearing,
overall.width + onechar->rbearing);
overall.width += onechar->width;
}
}
}
if (ret == BadTerminate)
/* The passed string "text" is terminated unexpectly, stop!*/
break;
text += scanned;
text_len -= scanned;
}
if (max_ink_extents) {
max_ink_extents->x = overall.lbearing;
max_ink_extents->y = - overall.ascent;
max_ink_extents->width = overall.rbearing - overall.lbearing;
max_ink_extents->height = overall.ascent + overall.descent;
}
if (max_logical_extents) {
max_logical_extents->x = 0;
max_logical_extents->y = - max_ascent;
max_logical_extents->width = overall.width;
max_logical_extents->height = max_ascent + max_descent;
}
*num_chars = count;
return (count <= buffer_size);
#endif
/*--------------------------- END ---------------------------------------*/